Zone 20
Zone 20 : Area in which combustible dust, as a cloud, is present continuously or frequently, during normal operation, in sufficient quantity to be capable of producing an explosive concentration of combustible dust mixed with air, and/or where layers of dust of uncontrollable and excessive thickness can be formed. This can be the case inside dust containment areas where dust can form explosive mixtures frequently or for long periods of time. This occurs typically inside equipment [IEC 61241-3, definition 2.11]
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